It really does look like a global half degree switching back and forth between the two hemispheres that operates on a thousand year cycle or so. Just think. The last high was around 1000 AD and perhaps also 0 AD and the rise of the Roman Empire in Europe. The little Ice Age hit with a vengeance around 1500 AD and the Western Roman Empire fell around 500 AD when the Rhine froze over. What little we know of the prior millennium suggests that the same cycle showed itself there to. And that half degree is more than sufficient to give us all the currently experienced warming effects in the north.
As has been said, this is actually a cause for celebration. Agricultural productivity in the Northern hemisphere will increase. The Arctic will be clear of ice every summer for at least two months and this should happen even in the next decade. This will naturally create a huge fishery. So shut up already.
And absolutely none of this needs to be linked to the production of excess CO2 on the basis of the record of the past 12,000 years.
That still leaves us with the ongoing problem of the build up of CO2 in the atmosphere. That is for sure a human created problem and must be ameliorated. What we have burned so far has forced a thirty percent gain. What exists in the ground is sufficient to make this a 100 % gain. What is more, it is a reasonable assumption that man will burn all available fossil fuels no matter what else is done and even if it is dragged out over a thousand years. It is simply too efficient as a feedstock to not be used.
As we have shown, the best solution to that problem is carbon sequestration by way of the global production of terra preta soils. It really is that simple. Of course the chatterers will try to obstruct the solution as usual, but they all die out eventually and it will simply become mandatory traditional practice.
As was true in the Amazon for at least a thousand years.